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Definition df-mnf 9367
Description: Define minus infinity as the power set of plus infinity. Note that the definition is arbitrary, requiring only that be a set not in and different from (see mnfnre 9372 and pnfnemnf 11042). (Contributed by NM, 13-Oct-2005.) (New usage is discouraged.)
Assertion
Ref Expression
df-mnf

Detailed syntax breakdown of Definition df-mnf
StepHypRef Expression
1 cmnf 9362 . 2
2 cpnf 9361 . . 3
32cpw 3837 . 2
41, 3wceq 1687 1
Colors of variables: wff setvar class
This definition is referenced by:  mnfnre  9372  mnfxr  11039  pnfnemnf  11042
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